Furnace.



A. P. SMITH.

FURNAGE.

l APPLICATION FILED AUG.11, 1911. 1,052,760. Patented Feb.11,1913.

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A. P. SMITH.

FURNAGB.

APPLIOATION FILED 11116.11, 1911.

Patented Feb. 11, 1913.

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A. P. SMITH.

PURNACE.

APPLICATION FILED AUG. 11, 1911. 1,052,760. Patented Feb. 11,1913.

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c?. P. fm1/ .mmw/ @y his enfer-n ey; @ZMWM U rre-D srirrns PATENT onirica.

"ARTHUR P. SMITH, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR OF ONElFOURTH TO GEORGE G. TIERNEY, 0F MINNEAPOLIS, MINNESOTA.

FURNACE.

Lenawee.

Be it Aknown that I, ARrHUii P. SMITH,

.a eitiaen'of the United States, residing at Minneapolis, in the county of Hennepin and StateofMinnesota, have invented certain new -and useful Improvements in Furnaces;'and l do hereby `declare the following to be'ayfull; clear, and-@enact description .of the invention, such as willA enable others VIGWS.

skilled in :theartto which it appertains to make and use the-saine.

My invention hasfor-its object to provide a hot air furnace' of vveryhigh elciency, and to suchends the invention consists of the novel devices'and combinations of clelvices' hereinafter describeda'and defined in the claims; `.More'particularly stated, the invention is directed to the improvement of hot'air furnaces wherein 'a down draft is 4employed so that ythe combustion of theA coal takes place jar'angitientfof' air supply land draft con- .diii'ts andv radiator. The invention, however,involves other novel and important featurefs` of construction,- all of which willA hereinafter be described and defined in the claims; f'- .y

Infith'e accompanying drawings which illustrrarteft'he invention, like characters in-` dicate like parts throughoiitthe several .Referring to thedrawings, Figure 1 is a vviewchiefly inv vertical section, bnt'with some parts in f ull, showing -the preferred forni of my improved furnace; Fig. 2 is a.

' plan view of the base of the furnace; Fig.' 3

is a side elevation ofthe saine with some parts broken away; Fig. 4 is a horizontal' section takenon the line se* of Fig. 1,

' looking downward on fthe parts; l `ig. 5

a horizontal section also taken on the line :eff x5. of Fig. 1, but looking upward at the parts, and some parts being broken away;

Fig. G is a plan view with some partshroken away, ,and some parts sectioned showing thev radiator or secondary combustion chamber of thefurnace; and Fig. 7 is avertical section taken onl the irregular line a 1:7 of Fig.

6, and'showing some of the parts separated.vv

yThe base 1,4 of the 'furnace is preferably a .cust structure, 'and' as shown. 'i1 is pioi'ided with an integrally fformed vapor or Vwater i pun 2.' This vaporlfpanQ is approximately Specification of Letters Patent.

Patented Feb. 1p1, 1913.'

Appiicatiqn sied August 11,'1911. serial No. 643,537. A

crescent shaped'or C-shaped in plan, and its inner wall is preferably grooved Vto receive the lower edge of the shell 3-of the ash pot. This ash pot shell 3v supports the `gratos 4 which-'may be of the usual or anyv suitable construction.V

The fire pot 5is preferablya cast approximately cylindrical structure, having, however, a slight downward flare, and it is provided Ywith a plurality, as'shown, of three outwardly and upwardly curved elbows 6. The fire pot 5 is supported by the ash pit shell 3, the latter being preferably grooved to receive and form a tight joint with the lower edge of the said tire box.-

rfhe primary combustion 'chamber is formed within the lire box-5 and the said fire box supports a dome 8 which is pref erably a cast structure having integrally formed therewith, an outwardly extended feed door neck 9 and afresh air supply conduit 10, which latter terminates within the dome in downwardly curvedair conduits 11. The feed doorneck 9, the neck of the ash airintake conduit 10 all openthrongh the front plate 12 of the outer or inclosing cas ing 13, and the said conduits'are adapted to be opened andV closed, respectively, by a feed door 14, an ash pit door 15 and a dainper or fresh air cont-rolling valve-16. The

ash pit door 15 is shown as provided withl the customary draft regulatingA damper 17..

` As shown, the' freshair intake'conduit 10 is provided with Athree delivery branches' or y conduits 11 spaced requidistant circumferen-g tially of the dome and, .at,j th eirlower ends,`

opening into the Aprimarycombustion''charnber approximately at the line of .the conljunction between the fire box 5 and dome. .\lso, it will benot/e'd, that the lower or delivery ends of the said conduits 1l are lo cated directly over corresponding draft conduits afforded by the elbows 6. Also it should be noted, Athat the conduits-in the said elbows extend to the bottom ofthe lire box and close to the grate. At the junction of the. branch conduits 11 withv the main fresh air intake conduit 10,'there is a. central'openinglS that is normally closed lby a stopper plate .19, shown as provided with a threaded stem 20 extended through the topv of the-dome and provided with a nut. 21,by means of which, the said plate 19 is tightly clamped injworking position.

'i is Located Wit-hin the upper portion vof the casing 13, andnearly surrounding the upper portion of the dome 8 is a radiator of approximately the general form, the samebe-A ing approximately crescent-'shape or C-shape in plan.v This radiator, as shown, is made up of upper. and lower .cast sections'22 and Y an interposed'horizontalpartition 23. The

partition 23 terminates Ashort of the ends of' the radiator, thereby 'leaving a comrminicating passage 24b'e'tw'een the upper and lower compartments of the "said radiator. The

lowenvsection lof the radiator is providedin its bottom with three ports 25 that are connected short vertical-pipes 26'to the upperextremities of the thrjee elbows 6 of the'fire pot 5 The central port-25 directly underlies a central pox-'t in lthe partition'x 23 which zis adapted-to beop'ened and-closed, at will,

by adamper 27, the stein of which, as shown,

4extends to the exteriorof the'casing'andis provided with fanoperating'arm 28. Di-- rectly -above the'damper27, the upper section ofA the -radiato'r .2 2 isv provided with a smoke pipe 29 that extends outward through the casing and is Vadapted to ..be'connected .to a chimney in any suitable-way. The

lower section of the r'adiatonju'st below the l damper 27 is 'shownjas' provided with a clean-out pipe 30 that. :extends through the casing 13 and is normallyclosed by a stop- '.fire box 5through the feed-door neck 9 and,

when desired,'it may; bel piled high into the dome. The fresh air forfsupporting the combustionwhen the 4damper 16 .is opened,

is drawn in throughthe conduit 10 'and itsv i branches 11 and delivered through the upper port-ion of the body of the coal, closeto the Shell of the ire box, and -from thence, is

drawn over throughA the coal and outward through theI elbows v6, and from thence, into Y theradiator'22. This down draft is equally 4distributed around'the uter portion of the bodyV of the coal ,and theA combustion is caused to take place close t-o the grates, and

y especiallyclose to the gratos and in the imveo mediate vicinity of the elbows 6,' which lso lat-ter.A willbe more'or less iilled-with the burning coal. In this way, all "offthe gases outward' burned are drawn downward an from the body of the coal andare b urned partly in the'elbow's Gand partly in the radiator 22. A

f Inasmuchi as the draftis' downward through thebody of thel coa-l, the'pper portion of thecoal VAwillbe kept comparatively cool, but by conductiomthe metalliowalls of the fresh air supply -conduits 11 will be quite highly heat-ed, so that theair delivered to the coal therethroughwill be su or ver considerably heated, andj ence, deliveredr to the burning coal'in better condi'- sa tion to elect complete combustion and therethrong r-heated by'elirninate'productionof smoke. The production of smokeis, aswell known, due to poor Vorincomplete combustion.

For starting the fire, or any oth er time when anextremelystrong draft is desired,

the damper 27l may be opened so; as to thereby directlyronn'ect the fire box'jnd; the

smoke pipe. If heatingfeficiency is desired,

the said damper .2 7 is closed,A and then all other products of combustion must pass ator 22, to the end ports 2 4, thenceupward into the upper section off the said radiator,l and through the latter-to the4 smokefpipe.

. one usually maintained-When the furnace is.

This lat-ter condition will, of course, 'be the in running condition. i

The vapor or water pan 2, it will be noted,

covers the entire 'bottom portion ofthe air space between' the 'furnace .proper and the '3`5 finclosing Jacket, so that all' dustfor light particles recipitated within the jacket from the air w ich 1s circulated therethrough and the lower compartment of the radi# heated therein, will dropinto the Awater contained in the said pan` 4The air is-thus continuously purified or relieved fromdust particles which are carried therewith. -The time to time to carry off-'theprecipitated particles, and supplied with clean Waterforevaporat-mg purposes. To' facilitate this .water in the pan shouldbe changed fromv action, the water pan 2 is'provided at one lextremity with a' water .inlet port 25, and, at

its other extremity, is provided with a'drain port 2". Also -in a'direction from tl ie port 2a toward the 'port 2", the bottom of the'panis gradually inclined downwardly toffacili-l -loo tate draining, A ny suitable source of water"- supply may becb'nnected tothe port- 2,;and

the `port 2"- may- 'be provided any suitable valve orplugand may be connectedto any suitable form of drain pipe or conduit.;

What I claim ist' 1. In a furnace, 'a tirev pot having a grate structure and provided with'combineddraft ing from the sides thereof and from 'points immediately above the said grate structure,

in combination with a dome overlying said -firepot an'd provided with a cent-ral air chamion conduits and combustion chambersextendf j ber in its top, an air intake conduit leading y to said air chamber, and a multiplicity of airV conduits leading downward from said air chamber and opening into the upper ortion' of said fire p ot immediatelyT 'above t e cordelivery ends immediatelyover the`inner extremities of said draft conduits.

.combined draft conduits and combustion chambers.

4. In a furnace, the combination with av lire pot having a plurality of circumferentially spaced, upwardly extended draft conduits leading outward from the sides thereof, a radiator to which all of the said draft conduits `are connected, the said radiator ,having a damper-equipped passage and a smoke pipe connection directly connected to d one of the said draft conduits, an air conduit for supplying air to the .upper-.portion of said fire pot, and a dome overlying said fire pot and provided with a feed door neck and a fresh air intake conduit, said latter havin a. multiplicity of branch conduits exten ing along the inner surface of said dome an arranged to deliver the fresh air` directly to the upperportion of said fire pot.

5. In a furnace, the combination with a.

lire pot having a plurality of cirCumferen--v tially spaced draft'conduits radiating upwardfrom the sides thereof, of a dome overlying the said ire pot and provided with a feed door neck and with a fresh air conduit following the said feed door neck and terminating in a plurality of branches following thc inner wall of said dome and terminating in position todeliver air to the upper portion of the said fire pot.

6. In a furnace, the combination with a lire 'pot having a plurality of circumferentially spaced draft conduits radiating upward from the sides thereof, of a dome overlying the said fire pot and provided with a feed door neck and with a fresh air conduit following the said feeddoor neck and. ter-` minating in a plurality of branchesfollow ing the inner wall of said dome ,and ter-- minating in posit-ion to deliver air4 to the upper portion of the said tire pot, the delivery end of each of said branch air conduits being located directly over one of the 7 said draft conduits.-

In testimony whereof I affix my signature in presence to two witnesses.

- ARTHUR P. SMITH. Witnesses:

HARRY D. KILGoRn, F. D. MERCHANT.

oples of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

